Device for removing broken taps.



No. 702,0", Patented 1m I0, I902.

J. KINVALL.- H v DEVIQE FUR REMOVING BROKEN TAPS.

' (Application filed 1m. 15, 1902.

(No Model.)

n "m iul fiPl Wines a es efokn I "m: uomus PEYERS ca. mom-umm.WASHINGYON u c UNITED STATES PATENT OFFTCE.

JOHN KINVALL, OF WORCESTER, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO JOHNSCHROEDER 'OF WORCESTER, MASSACHUSETTS.

DEVICE FOR REMOVING BROKEN TAPS. f

SPECIFICATION forming part of Letters Patent No. 702,011, dated June 10,1902.

' Application filed March 15,

To all whom it may concern:

Be itknown that I, JOHN KINVALL, a citizen of Sweden, residing atWorcester, in the county of Worcester and Commonwealth of Massachusetts,have invented a new and useful Improvement ina Device for RemovingBroken Taps, of which the following is a specification, accompanied bydrawings forming a part of the same, in which- Figure 1 represents anelevation of adevice for removing pieces of taps broken in the work andembodying my invention. Fig. 2 represents a similar View with thetap-engaging bars extended beyond their cylindrical holder. Fig. 3 is anelevation of myimproved device represented as engaging a piece of brokentap. Fig. 4 is a top view; and Fig. 5 is a sectional view on line 5 5,Fig. 1.

Similar reference-letters refer to similar parts in the different views.

My invention relates to a device adapted'to engage and remove pieces oftaps which have been broken off in a tapped hole; andit consists of acylindrical holder whose diameter is substantially equal to the diameterof the tapped hole and which is providedwith a polygonal section at oneend to receive a wrench and with longitudinal grooves corresponding withthe longitudinal grooves in the tap to receive sliding tap-en gagingbars having their upper ends held in a sliding collar by which thetap-engaging bars are moved lengthwise the cylindrical holder.

Referring to the accompanying drawings, A denotes the cylindricalholder, having a polygonal section A and longitudinal grooves 13 B toreceive the sliding tapengagingbars C, which have upper ends bent atright'angles and inclosed between the two clamping parts D D, which areclamped together by means of the screws E E, forming a collar E Thediameter of the cylindrical and 1ongitudinaly-grooved holder A issubstantially equal to the diameter of the tapped hole F in the metalpiece F, from which it is desired to remove a piece G of a broken tap.The 1ongitudinal grooves B B correspond with the grooves H H in the tap,so that when the cylindrical holder A is inserted in the tapped holewith its end resting upon the end of the broken tap, as represented inFig. 3, the collar E can be forced down upon the holder, causing theends of the tap-engaging bars C C to as described.

1902. Serial No. 98,434. (No model.)

project beyond the end of the holder A into the grooves H H of the tap,and the holder 5 5 and its tap-engaging bars are then rotated by theapplication of the wrench to the polygonal end A, causing the piece G ofbroken tap to be turned and unscrewed from the tapped hole F. In orderto maintain the holder A in alinement with the piece of broken tap andto retain the tap-engaging bars C within their respective grooves B, Ipreferably inclose the holder A and bars 0 between the collar D and thepiece of metal F, which contains the broken tap, with a sleeve I,provided with a central hole J, of the proper diameter to fit the holderA, and having its lower end K at right angles with the concentric hole Jand adapted to restupon the surface L of the piece of metal F. Thedevices are made in different sizes, corresponding to taps of difierentdiameters; but they are substantially the same in their construction andmethod of operation.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. In a device for removing-broken taps, the combination of 'a holderprovided with longitudinal grooves, of tap-engaging bars held in saidgrooves and capable of sliding 8o therein,means for simultaneouslysliding said bars in said grooves into engagement with the grooves inthe tap, substantially as described. I

2. The combination with a holder provided with longitudinalgrooves for aseries of tap- 8 5 engaging bars, tap-engaging bars held in said groovesand capable of sliding therein, a col-. lar for holding said, bars andsliding them simultaneously in said grooves, substantially 3., Thecombinationof aholder having longitudinal grooves, tap-engaging barsheld in said grooves, a clampingcollar capable of sliding on said holderand clamping the ends of said bars, substantially as described.

4.. The combination-of the grooved holder, tap-engaging bars held insaid grooved holder and capable of sliding therein, a'collar engagingsaid bars, and a sleeve inclosing said holder and bars, substantially asdescribed.

Dated this 12th day of March, 1902.

JOHN KINVALL.

Witnesses:

Tnnonon BERGMAN, RUFUS B. FOWLER.-

